Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 36
Fig 24.—Coating Paper with ParaffinWax. MAGNETIC FIELDS. 17 representation of the magnetic field surrounding the magnet,as in Figs. 25 and 26. When it is desired to make a perma- … Flg. 23.—Making Magnetic Field of a Bar Magnet. nent record of the magnetic field, a piece of paraffin-coatedpaper is used in place of the cardboard. After the held is
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
